WO2018173705A1 - Fastening member - Google Patents
Fastening member Download PDFInfo
- Publication number
- WO2018173705A1 WO2018173705A1 PCT/JP2018/008161 JP2018008161W WO2018173705A1 WO 2018173705 A1 WO2018173705 A1 WO 2018173705A1 JP 2018008161 W JP2018008161 W JP 2018008161W WO 2018173705 A1 WO2018173705 A1 WO 2018173705A1
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- WO
- WIPO (PCT)
- Prior art keywords
- alloy material
- fastening member
- thread
- screw thread
- main body
- Prior art date
Links
- 239000000956 alloy Substances 0.000 claims abstract description 100
- 230000002093 peripheral effect Effects 0.000 claims abstract description 75
- 229910045601 alloy Inorganic materials 0.000 claims description 19
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 15
- 229910052782 aluminium Inorganic materials 0.000 claims description 15
- 239000000463 material Substances 0.000 description 13
- 238000002591 computed tomography Methods 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- 239000013585 weight reducing agent Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B39/00—Locking of screws, bolts or nuts
- F16B39/22—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B33/00—Features common to bolt and nut
- F16B33/02—Shape of thread; Special thread-forms
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
- F16B25/0036—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw
- F16B25/0094—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw the screw being assembled or manufactured from several components, e.g. a tip out of a first material welded to shaft of a second material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B33/00—Features common to bolt and nut
- F16B33/06—Surface treatment of parts furnished with screw-thread, e.g. for preventing seizure or fretting
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
- F16B35/04—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws with specially-shaped head or shaft in order to fix the bolt on or in an object
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B39/00—Locking of screws, bolts or nuts
- F16B39/22—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening
- F16B39/28—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening by special members on, or shape of, the nut or bolt
- F16B39/30—Locking exclusively by special shape of the screw-thread
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
Definitions
- This disclosure relates to a fastening member.
- Patent Document 1 describes a bolt whose base is made of aluminum and whose surface is covered with nickel.
- bolts made of a combination of two types of alloys such as clad materials including aluminum can achieve weight reduction, but there are still problems in reliability and durability as a fastening structure. There were many things. That is, loosening may occur during repeated use.
- an object of the present invention is to reduce the occurrence of looseness while improving the weight of a fastening member and to improve the reliability and durability as a fastening structure.
- a fastening member is a fastening member in which a thread is formed, and a portion including a top part of the thread is formed of a first alloy material, and in a circumferential direction.
- Another fastening member is a fastening member having a head portion and a shaft portion on which a screw thread is formed, and the shaft portion is provided on a radially outer side of the main body portion and the main body portion.
- the outer peripheral portion of the screw thread is made of a first alloy material and forms at least a portion including the top of the screw thread, and the main body portion of the screw thread is The second alloy material having a higher tensile strength than the first alloy material, and forming a portion including the root of the screw thread, wherein the outer peripheral portion of the screw thread is formed of the shaft portion. It has a thick part with the maximum thickness in the circumferential direction and a thin part with the minimum thickness in the circumferential direction of the shaft part.
- Another fastening member according to the present invention is characterized in that the thick portion and the thin portion are formed by the outer peripheral portion being eccentric with respect to the main body portion.
- Another fastening member according to the present invention is characterized in that the thick portion and the thin portion are on opposite sides of the central axis of the shaft portion.
- one or more screw threads are formed on a screw portion formed at an axially intermediate portion of the shaft portion, and the screw thread makes a round around the shaft of the shaft portion.
- the thick portion and the thin portion are formed one by one in the screw portion at least during one round of the screw thread.
- the first alloy material is a JIS standard 1000 series or 6000 series aluminum base alloy
- the second alloy material is a JIS standard 2000 series or 7000 series aluminum base alloy. It is an aluminum-based alloy.
- Another fastening member is a fastening member in which a screw thread is formed, and includes a main body portion and an inner peripheral portion provided on a radially inner side of the main body portion,
- the inner peripheral portion is made of the first alloy material and forms at least a portion including the top of the screw thread, and the body portion in the screw thread has a higher tensile strength than the first alloy material.
- a portion including the root of the screw thread, and the inner peripheral portion of the screw thread has a thick wall portion having a maximum wall thickness in the circumferential direction, and a circumferential direction. And having a thin wall portion having a minimum thickness.
- FIG. 1 is a side view showing a configuration of a fastening member according to Embodiment 1 of the present invention.
- FIG. 2 is a cross-sectional view including the central axis of the fastening member shown in FIG.
- FIG. 3 is a schematic diagram of a CC cross section of the fastening member shown in FIG.
- FIG. 4 is an enlarged view of region A in FIG.
- FIG. 5 is an enlarged view of region B in FIG.
- FIG. 6 is an X-ray CT scan photograph of a cross section including the central axis of the bolt according to the first embodiment.
- FIG. 7 is an X-ray CT scan photograph of a cross section including the central axis of the bolt according to the second embodiment.
- FIG. 1 is a side view showing a configuration of a fastening member according to Embodiment 1 of the present invention.
- FIG. 2 is a cross-sectional view including the central axis of the fastening member shown in FIG.
- FIG. 3
- FIG. 8 shows the results of the Junker vibration test of the bolts according to Examples 1 and 2.
- FIG. 9 is an enlarged view of a cross section including the central axis of the fastening member according to the second embodiment of the present invention.
- FIG. 10 is another enlarged view of a cross section including the central axis of the fastening member according to the second embodiment of the present invention.
- FIG. 11 is a plan view showing a configuration of a fastening member according to Embodiment 3 of the present invention.
- 12 is a cross-sectional view taken along the line DD of FIG.
- FIG. 1 is a side view showing a fastening member 1 according to Embodiment 1 of the present invention.
- the fastening member 1 is a bolt (a type of male screw) having a head portion 3 having a hexagonal shape and a shaft portion 2 having a rod shape.
- the shaft portion 2 is provided with a screw portion 22 that forms a plurality of screw threads 21 at an intermediate portion in the axial direction (extending direction). Both ends of the screw thread 21 are displaced in the axial direction, and make a round around the axis of the shaft portion 2.
- Each screw thread 21 is continuous with the screw threads 21 adjacent in the axial direction.
- the plurality of screw threads 21 in the screw portion 22 extends in a spiral shape.
- the shape of the head 3 is not limited to a hexagonal shape, and may be a dish shape, a flat shape, or other shapes.
- FIG. 2 is a cross-sectional view including the central axis in the axial direction of the shaft portion 2 of the fastening member 1.
- the shaft portion 2 includes a main body portion 12 that is an inner peripheral portion thereof, and an outer peripheral portion 14 that constitutes an outer peripheral portion of the shaft portion 2 (a radially outer side of the main body portion 12).
- the outer peripheral part 14 and the main-body part 12 are comprised from the 1st alloy material 1a and the 2nd alloy material 1b which are two types of mutually different alloys, respectively.
- the first alloy material 1 a constitutes the outer peripheral portion 14 on the radially outer side of the main body portion 12.
- the second alloy material 1 b constitutes the main body portion 12 that is the inner peripheral portion of the shaft portion 2.
- the second alloy material 1 b constitutes the main body portion 12
- the second alloy material 1 b is a material having a higher strength than the first alloy material 1 a constituting the outer peripheral portion 14, particularly a high tensile strength.
- a clad material of the first alloy material 1a and the second alloy material 1b may be used.
- first alloy material 1a and the second alloy material 1b two kinds of alloys having the same element as a main component can be used.
- two types of aluminum-based alloys can be used.
- first alloy material 1a 1000 series or 6000 series aluminum-based alloys can be used.
- JIS standard A6063 can be used as the first alloy material 1a.
- JIS standard A6056 can be used.
- These aluminum-based alloys have relatively high strength, excellent corrosion resistance and stress corrosion resistance, and are relatively lightweight.
- second alloy material 1b 2000 series or 7000 series aluminum-based alloys can be used.
- JIS standard A2618 and A2024 can be used as the second alloy material 1b.
- high strength aluminum-based alloys that have a relatively high tensile strength and are relatively light. In particular, it has higher tensile strength than the aluminum-based alloy as the first alloy material 1a.
- first alloy material 1a and the second alloy material 1b two kinds of alloys mainly composed of different elements can be used.
- the main body part 12 exists on the inner peripheral side of the shaft part 2, and the outer peripheral part 14 covers the outer peripheral part.
- the outer peripheral portion 14 does not need to completely cover the main body portion 12. For example, as shown in FIG. 2, a part of the head portion 3 or an end portion of the shaft portion 2 opposite to the head portion 3 is It may be exposed.
- FIG. 3 is a schematic view of the fastening member 1 taken along the line CC (cross-sectional view in the central axis direction of the shaft portion 2).
- the thickness of the outer peripheral portion 14 differs at the circumferential position of the shaft portion 2.
- the outer peripheral portion 14 has a maximum thickness portion and a minimum thickness portion in a region opposite to the central axis of the shaft portion 2 (a portion on the opposite side of about 180 degrees). That is, the outer peripheral portion 14 constitutes the outer peripheral portion of the main body portion 12 in a state eccentric to the outer side in the radial direction with respect to the main body portion 12.
- the outer peripheral portion 14 being eccentric with respect to the main body portion 12 means that the virtual central axis of the outer peripheral portion 14 and the virtual central axis of the main body portion 12 are the same as those of the shaft portion 2. In a cross-sectional view in the central axis direction, the positions are shifted from each other and do not match.
- FIG. 4 is an enlarged view of a region A (maximum thickness portion) in FIG.
- the top 21 a of the screw thread 21 in the screw portion 22 is composed of the outer peripheral portion 14. That is, the top 21a of the screw thread 21 is composed of the first alloy material 1a.
- the thickness of the first alloy material 1a in the maximum thickness portion is the maximum thickness T1 at least in the screw thread 21 including the top portion 21a.
- the base side of the screw thread 21 is constituted by the main body portion 12. That is, the root side of the screw thread 21 is constituted by the second alloy material 1b.
- the valley portion 21b of the screw portion 22 is thinly covered with the outer peripheral portion 14, and the main body portion 12 is not exposed. That is, the valley portion 21 b is configured by the first alloy material 1 a that is the outer peripheral portion 14.
- FIG. 5 is an enlarged view of a region B (minimum thickness portion) in FIG.
- the minimum thickness portion is formed on the same screw thread 21 on the opposite side to the maximum thickness portion (a portion opposite to about 180 degrees) across the central axis of the shaft portion 2.
- at least the top portion 21 a of the screw thread 21 in the minimum thickness portion is composed of the outer peripheral portion 14. That is, the top 21a of the thread 21 of this portion is composed of the first alloy material 1a.
- the thickness of the first alloy material 1a in the minimum thickness portion is the minimum thickness T2 ( ⁇ T1) at least in the screw thread 21 including the top portion 21a.
- the base side of the screw thread 21 is constituted by the main body portion 12.
- the root side of the screw thread 21 is constituted by the second alloy material 1b.
- the valley portion 21b of the screw portion 22 is thinly covered with the outer peripheral portion 14, and the main body portion 12 is not exposed. That is, the valley portion 21 b is configured by the first alloy material 1 a that is the outer peripheral portion 14.
- the outer peripheral portion 14 made of the first alloy material 1 a has the maximum thickness T1 and the minimum thickness T2 in one screw thread 21. . That is, the outer peripheral portion 14 made of the first alloy material 1 a has a thick portion 23 and a thin portion 24 that are eccentric to the outer side in the radial direction with respect to the main body portion 12 in one screw thread 21.
- the maximum thickness portion (thick portion 23) and the minimum thickness portion (thin portion 24) of the outer peripheral portion 14 are not limited to one place, and a plurality of portions are provided in one screw thread 21. May be.
- the maximum thickness portion (thick portion 23) and the minimum thickness portion (thin portion 24) of the outer peripheral portion 14 do not need to be provided on all the screw threads 21 in the screw portion 22. Only a part of the thread 21 may be used. Furthermore, the maximum thickness part (thick part 23) and the minimum thickness part (thin part 24) which the outer peripheral part 14 has can also take the structure which does not exist in the 180 degree opposite side mutually.
- the fastening member 1 When the fastening member 1 is fastened to the mating member, the thread 21 of the screw portion 22 is engaged with the mating member and fastened. At this time, in the thick portion 23, the portion of the first alloy material 1a is larger than the other outer peripheral portion, while in the thin portion 24, the portion of the first alloy material 1a is smaller than the other outer peripheral portion. That is, two types of materials having different strengths exist between the thick portion 23 and the thin portion 24 with different constituent ratios. As a result, the distribution of the axial load (withstand load) in the thick portion 23 and the thin portion 24 is not uniform, and an oblique load is applied to the central axis of the shaft portion 2. In combination, it is possible to effectively prevent loosening.
- the fastening member 1 is used as the whole fastening member in the shaft portion 2 because the outer peripheral portion 14 is made of the first alloy material 1a and the main body portion 12 is made of the second alloy material 1b.
- the material can be optimized according to the required strength and characteristics, and light weight can be realized.
- the fastening member 1 can be manufactured more easily.
- the thick part 23 and the thin part 24 are located in the area
- 1000-series and 6000-series aluminum-based alloys as the first alloy material 1a constituting the outer peripheral portion 14 are excellent in corrosion resistance and stress corrosion resistance. By covering the shaft portion 2 with these materials, reliability as a fastening member can be further increased. Further, since the aluminum-based alloy is relatively light, the fastening member 1 can be made lighter.
- Example 1 an example of a specific configuration of the fastening member 1 described above will be described.
- Example 2 As specific configuration examples, the following Example 1, Example 2, and a conventional example were produced.
- the fastening member 1 (bolt) of the present embodiment uses a rod-like clad material in which the body portion 12 of the shaft portion 2 is made of JIS standard A2618 and the outer peripheral portion is covered with JIS standard A6063. Thereafter, the screw part 22 was formed by a rolling process.
- the bolt size is M8 ⁇ 50.
- FIG. 6 is an X-ray CT scan photograph of a cross section including the central axis of the bolt according to Example 1.
- the thickness of the outer peripheral portion 14 made of JIS standard A6063 at a certain thread 21 is 607 microns, while the thickness of the outer peripheral portion 14 on the opposite side across the central axis is 680 microns. It was.
- Example 2 The fastening member 1 (bolt) of this example was also produced in the same manner as in Example 1 except that the thickness of the outer peripheral portion of the clad material was changed.
- FIG. 7 is an X-ray CT scan photograph of a cross section including the central axis of the bolt according to the second embodiment.
- the thickness of the outer peripheral portion 14 made of A6063 in a certain thread 21 is 370 microns, while the thickness of the outer peripheral portion 14 on the opposite side across the central axis is 318 microns.
- FIG. 8 shows the results of the Junker vibration test of the bolts according to Examples 1 and 2.
- the Junker vibration test was performed based on the screw looseness vibration test standard DIN25201-4.
- both the bolts according to Example 1 and Example 2 maintain a high axial force even when the number of load vibrations increases as compared with the bolts of the conventional example. I understand.
- the axial force decreases as the number of load vibrations increases, whereas in Examples 1 and 2, a constant axial force is maintained.
- the bolts according to Examples 1 and 2 show high reliability as the fastening member 1.
- the fastening member according to the second embodiment will be described. Portions common as constituent elements with the fastening member 1 according to the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
- the main body 12 has a convex shape corresponding to the thread 21 on the outer periphery thereof.
- the outer peripheral portion 14 has a concave shape corresponding to the convex shape of the outer periphery of the main body portion 12 on the base side. That is, a part of the outer periphery of the main body 12 flows into the screw thread 21.
- FIG. 9 is an enlarged view of the maximum thickness portion.
- the top 21 a of the screw thread 21 in the screw portion 22 is composed of the outer peripheral portion 14. That is, the top 21a of the screw thread 21 is composed of the first alloy material 1a.
- the thickness of the first alloy material 1a in the maximum thickness portion is the maximum thickness T3 at least in the screw thread 21 including the top portion 21a.
- the thickness of the first alloy material 1 a according to the second embodiment is the distance between the convex top of the main body 12 and the top of the screw thread 21.
- the base side of the screw thread 21 is constituted by the main body portion 12.
- the root side of the screw thread 21 has a convex part on the outer periphery of the main body part, a part is constituted by the second alloy material 1b, and the other part is constituted by the first alloy material 1a.
- the valley portion 21b of the screw portion 22 is also configured from the outer peripheral portion 14, and the main body portion 12 is not exposed. That is, the valley portion 21b is constituted by the first alloy material 1a.
- FIG. 10 is an enlarged view of the minimum thickness portion.
- the minimum thickness portion is formed on the same screw thread 21 on the opposite side to the maximum thickness portion (a portion opposite to about 180 degrees) across the central axis of the shaft portion 2.
- at least the top 21 a of the screw thread 21 in the minimum thickness portion is composed of the outer peripheral portion 14. That is, the top 21a of the thread 21 of this portion is composed of the first alloy material 1a.
- the outer periphery of the main body portion 12 flows deeper into the inner side of the screw thread 21, and the height of the convex shape on the outer periphery of the main body portion 12 is higher than the maximum thickness portion.
- the thickness of the first alloy material 1a in the minimum thickness portion is the minimum thickness T4 ( ⁇ T3) at least in the screw thread 21 including the top portion 21a.
- the base side of the screw thread 21 is constituted by the main body portion 12. That is, the root side of the screw thread 21 is constituted by the second alloy material 1b.
- the valley portion 21b of the screw portion 22 is also configured from the outer peripheral portion 14, and the main body portion 12 is not exposed. That is, the valley portion 21b is constituted by the first alloy material 1a.
- the screw portion 22 of the fastening member 1 has the maximum thickness T1 and the minimum thickness T2 in the outer peripheral portion 14 made of the first alloy material 1a in one screw thread 21. That is, the outer peripheral portion 14 made of the first alloy material 1 a has a thick portion 23 and a thin portion 24 that are eccentric to the outer side in the radial direction with respect to the single thread 21 main body portion 12.
- the maximum thick part (thick part 23) which the outer peripheral part 14 has is not limited to one place, and may be provided in plurality in one screw thread 21. Further, the maximum thickness portion (thick portion 23) and the minimum thickness portion (thin portion 24) of the outer peripheral portion 14 do not need to be provided on all the screw threads 21 in the screw portion 22, Only some of the threads 21 may be provided.
- FIG. 11 is a plan view showing a configuration of a fastening member according to Embodiment 3 of the present invention.
- 12 is a cross-sectional view taken along the line DD of FIG.
- the fastening member 101 has a hollow cylindrical shape, and is a nut (a kind of female screw) in which a thread 201 is formed on the inner surface of a hole formed in the center.
- the fastening member 101 is provided with a screw portion 202 that forms a plurality of screw threads 201 on the inner peripheral surface thereof.
- the shape of the fastening member 101 is not limited to the hexagonal nut shape, and may be other shapes such as a flanged nut and a cap nut.
- the fastening member 101 includes a first alloy material 11a and a second alloy material 11b, which are two different types of alloys.
- the first alloy material 11 a constitutes the inner peripheral portion 104 that covers the surface of the screw thread 201.
- the 2nd alloy material 11b comprises the main-body part 102 which is the outer peripheral part of a fastening member.
- the first alloy material 11a is the same material as the first alloy material 1b
- the second alloy material 11b is the same material as the second alloy material 1b.
- the main body part 102 exists on the outer peripheral side of the fastening member 101, and the inner peripheral part 104 covers the inner surface of the hole formed in the central part.
- the top part 201a and the valley part 201b of the screw part 202 are covered with the inner peripheral part 104, and the main body part 102 (second alloy material 11b) is not exposed.
- the inner peripheral portion 104 does not need to completely cover the main body portion 102.
- the wall thickness of the inner peripheral portion 104 differs depending on the circumferential position of the hole formed in the central portion.
- the inner peripheral portion 104 has the same thickness 21 including the top portion 21a of the screw thread 201, and the opposite side (about the center axis of the hole formed in the central portion of the thickest portion (thick wall portion 203). It has a minimum thickness portion (thin wall portion 204) formed in a region of 180 ° opposite portion). That is, the inner peripheral portion 104 covers the surface of the main body portion 102 in a state where a part of the inner peripheral portion is eccentric inward in the radial direction with respect to the main body portion 102.
- the fastening member may be a small screw that is a male screw other than a bolt or a tapping screw.
- the present invention can include various embodiments not described herein, and various design changes and the like can be made without departing from the technical idea specified by the claims. Is possible.
- the fastening member according to the present invention is suitable for reducing the occurrence of looseness while improving the weight of the fastening member and improving the reliability and durability of the fastening structure.
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Abstract
Description
図1は、本発明の実施の形態1に係る締結部材1を示す側面図である。締結部材1は、六角形状を成す頭部3と、棒状を成す軸部2とを有するボルト(雄ねじの一種)である。軸部2には、その軸方向(延在方向)の中間部分に複数のねじ山21を形成するねじ部22が設けられている。ねじ山21は、両端が軸方向にずれ、かつ軸部2の軸のまわりに一周している。各ねじ山21は、軸方向で隣り合うねじ山21同士が連なっている。ねじ部22における複数のねじ山21は、らせん状に延びている。頭部3の形状は、六角形状に限定されるものではなく、皿型、平型、その他の形状であってもよい。 (Embodiment 1)
FIG. 1 is a side view showing a fastening
軸部2の材料として、第一の合金材料1aと第二の合金材料1bのクラッド材を用いてもよい。 FIG. 2 is a cross-sectional view including the central axis in the axial direction of the
As a material for the
第一の合金材料1aとして、1000系や6000系のアルミニウム基合金を使用することができる。例えば、第一の合金材料1aとして、JIS規格のA6063を使用することができる。その他にも、JIS規格のA6056を使用することができる。これらのアルミニウム基合金は、比較的強度が高く、耐食性や耐応力腐食性に優れ、比較的軽量な合金である。
第二の合金材料1bとして、2000系や7000系のアルミニウム基合金を使用することができる。例えば、第二の合金材料1bとして、JIS規格のA2618、A2024を使用することができる。これらは、比較的高い引っ張り強さを有し、比較的軽量な高強度のアルミニウム基合金である。特に、第一の合金材料1aとしてのアルミニウム基合金と比較して、高い引っ張り強さを有している。
その他に、第一の合金材料1aおよび第二の合金材料1bとして、異なる元素を主成分とする二種類の合金を使用することができる。 As the
As the
As the
In addition, as the
ここで、外周部14が、本体部12に対して偏芯しているとは、外周部14の仮想的な中心軸と、同じく本体部12の仮想的な中心軸とが、軸部2の中心軸方向の断面視において、その位置が互いにずれており、一致していないことを言う。 FIG. 3 is a schematic view of the
Here, the outer
ねじ山21の根元側は、本体部12によって構成されている。つまり、ねじ山21の根元側は第二の合金材料1bによって構成されている。ねじ部22の谷部21bは、薄く外周部14により被覆されており、本体部12が露出していない。つまり、谷部21bは、外周部14である第一の合金材料1aによって構成される。 FIG. 4 is an enlarged view of a region A (maximum thickness portion) in FIG. As shown in FIG. 4, at least the top 21 a of the
The base side of the
ねじ山21の根元側は、本体部12によって構成されている。つまり、ねじ山21の根元側は第二の合金材料1bによって構成されている。ねじ部22の谷部21bは、薄く外周部14により被覆されており、本体部12が露出していない。つまり、谷部21bは、外周部14である第一の合金材料1aによって構成される。 FIG. 5 is an enlarged view of a region B (minimum thickness portion) in FIG. The minimum thickness portion is formed on the
The base side of the
外周部14が有する最大の肉厚部分(厚肉部23)と最小の肉厚部分(薄肉部24)とは、一か所に限定されるものではなく、一つのねじ山21に複数設けられてもよい。また、外周部14が有する最大の肉厚部分(厚肉部23)と最小の肉厚部分(薄肉部24)とは、ねじ部22において、全てのねじ山21に設けられている必要はなく、一部のねじ山21だけであってもよい。またさらに、外周部14が有する最大の肉厚部分(厚肉部23)と最小の肉厚部分(薄肉部24)とは、互いに180°反対側に存在していない構成をとることもできる。 As described above, in the
The maximum thickness portion (thick portion 23) and the minimum thickness portion (thin portion 24) of the outer
本実施例の締結部材1(ボルト)は、軸部2の本体部12にJIS規格のA2618を使用し、その外周部分をJIS規格のA6063で被覆した棒状のクラッド材を、ヘッダー工程、熱処理工程の後、転造工程によってねじ部22を形成することにより作製した。
ボルトサイズはM8×50である。 Example 1
The fastening member 1 (bolt) of the present embodiment uses a rod-like clad material in which the
The bolt size is M8 × 50.
本実施例の締結部材1(ボルト)も、クラッド材の外周部分の厚さを変更した以外は、実施例1と同様に作成した。
図7は、実施例2に係るボルトの中心軸を含んだ断面のX線CTスキャン写真である。ある部分のねじ山21におけるA6063からなる外周部14の肉厚は、370ミクロンであり、一方で、それと中心軸を挟んで反対側の外周部14の肉厚は、318ミクロンであった。 (Example 2)
The fastening member 1 (bolt) of this example was also produced in the same manner as in Example 1 except that the thickness of the outer peripheral portion of the clad material was changed.
FIG. 7 is an X-ray CT scan photograph of a cross section including the central axis of the bolt according to the second embodiment. The thickness of the outer
従来例の締結部材(ボルト)は、軸部2および頭部3の形成にJIS規格のA2618材のみを使用した以外は、実施例1と同様に作成した。 (Conventional example)
The fastening member (bolt) of the conventional example was created in the same manner as in Example 1 except that only the JIS standard A2618 material was used to form the
以下、実施の形態2に係る締結部材について説明する。実施の形態1に係る締結部材1と構成要素として共通する部分については同一符号を付し、説明は省略する。図9および10に示すように、本体部12は、その外周においてねじ山21に応じた凸形状を有している。また、外周部14は、その根元側が、本体部12の外周の凸形状に応じた凹形状となっている。つまり、本体部12の外周の一部が、ねじ山21の内側に流入している。 (Embodiment 2)
Hereinafter, the fastening member according to the second embodiment will be described. Portions common as constituent elements with the
ねじ山21の根元側は、本体部12によって構成されている。つまり、ねじ山21の根元側は、本体部の外周における凸部があるため、一部が第二の合金材料1bによって構成され、それ以外の部分は、第一の合金材料1aから構成される。ねじ部22の谷部21bについても、外周部14から構成され、本体部12が露出していない。つまり、谷部21bは、第一の合金材料1aによって構成される。 FIG. 9 is an enlarged view of the maximum thickness portion. As shown in FIG. 9, at least the top 21 a of the
The base side of the
ねじ山21の根元側は、本体部12によって構成されている。つまり、ねじ山21の根元側は第二の合金材料1bによって構成されている。ねじ部22の谷部21bについても、外周部14から構成され、本体部12が露出していない。つまり、谷部21bは、第一の合金材料1aによって構成される。 FIG. 10 is an enlarged view of the minimum thickness portion. The minimum thickness portion is formed on the
The base side of the
外周部14の有する最大の肉厚部分(厚肉部23)は、一か所に限定されるものではなく、一つのねじ山21に複数設けられてもよい。また、外周部14の有する最大の肉厚部分(厚肉部23)と最小の肉厚部分(薄肉部24)は、ねじ部22において、全てのねじ山21に設けられている必要はなく、一部のねじ山21だけであってもよい。 As described above, the
The maximum thick part (thick part 23) which the outer
以下、実施の形態3に係る締結部材について説明する。実施の形態1または実施の形態2に係る締結部材1と共通する部分については同一符号を付し、説明は省略する。図11は、本発明の実施の形態3に係る締結部材の構成を示す平面図である。図12は、図11のD-D線断面図である。締結部材101は、中空円柱状をなしており、中心部に形成される穴の内面にねじ山201が形成されたナット(雌ねじの一種)である。締結部材101には、その内周面に複数のねじ山201を形成するねじ部202が設けられている。締結部材101の形状は、六角ナット形状に限定されるものではなく、フランジ付きナット、袋ナット等、その他の形状であってもよい。 (Embodiment 3)
Hereinafter, the fastening member according to the third embodiment will be described. Portions common to the
1a、11a 第一の合金材料
1b、11b 第二の合金材料
12、102 本体部
14 外周部
104 内周部
2 軸部
3 頭部
21、201 ねじ山
21a、201a 頂部
21b、201b 谷部
22、202 ねじ部
23、203 厚肉部
24、204 薄肉部 DESCRIPTION OF SYMBOLS 1,101
Claims (7)
- ねじ山が形成された締結部材であって、
前記ねじ山の頂部を含む部分は、第一の合金材料により構成され、周方向において、肉厚が最大となる厚肉部と、肉厚が最小となる薄肉部とを有し、
前記ねじ山の根元を含む部分は、前記第一の合金材料よりも高い引っ張り強さを有する第二の合金材料により構成される
ことを特徴とする締結部材。 A fastening member formed with a thread,
The portion including the top of the thread is made of the first alloy material, and in the circumferential direction, has a thick portion where the thickness is maximum, and a thin portion where the thickness is minimum,
The part including the root of the thread is made of a second alloy material having a higher tensile strength than the first alloy material. - 頭部と、ねじ山が形成された軸部と、を有する締結部材であって、
前記軸部は、本体部と、前記本体部の径方向外側に設けられた外周部とを有し、
前記ねじ山における前記外周部は、第一の合金材料により構成されるとともに、少なくとも前記ねじ山の頂部を含む部分を形成し、
前記ねじ山における前記本体部は、前記第一の合金材料よりも高い引っ張り強さを有する第二の合金材料により構成されるとともに、前記ねじ山の根元を含む部分を形成し、
前記ねじ山における前記外周部は、前記軸部の周方向で肉厚が最大となる厚肉部と、前記軸部の周方向で肉厚が最小となる薄肉部とを有することを特徴とする締結部材。 A fastening member having a head and a shaft portion on which a screw thread is formed,
The shaft portion includes a main body portion and an outer peripheral portion provided on a radially outer side of the main body portion,
The outer peripheral portion of the thread is made of a first alloy material and forms a portion including at least the top of the thread,
The main body portion in the screw thread is made of a second alloy material having a higher tensile strength than the first alloy material, and forms a part including the root of the screw thread,
The outer peripheral portion of the thread includes a thick portion having a maximum thickness in the circumferential direction of the shaft portion and a thin portion having a minimum thickness in the circumferential direction of the shaft portion. Fastening member. - 前記外周部が前記本体部に対して偏芯していることにより、前記厚肉部と前記薄肉部が形成されていることを特徴とする請求項2に記載の締結部材。 3. The fastening member according to claim 2, wherein the thick portion and the thin portion are formed by the eccentricity of the outer peripheral portion with respect to the main body portion.
- 前記厚肉部と前記薄肉部とは、前記軸部の中心軸を挟んで反対側にあることを特徴とする請求項2または3に記載の締結部材。 The fastening member according to claim 2 or 3, wherein the thick part and the thin part are on opposite sides of the central axis of the shaft part.
- 前記軸部の軸方向中間部に形成されたねじ部に一つ以上の前記ねじ山が形成され、
前記ねじ山は、前記軸部の軸のまわりに一周しており、
前記厚肉部と前記薄肉部とは、前記ねじ部において、少なくとも前記ねじ山が一周する間に1つずつ形成されていることを特徴とする請求項2~4のいずれか一項に記載の締結部材。 One or more thread threads are formed on a thread portion formed at an axially intermediate portion of the shaft portion,
The screw thread goes around the axis of the shank,
5. The thick wall portion and the thin wall portion are formed one by one in the screw portion at least during one round of the screw thread. Fastening member. - 前記第一の合金材料は、JIS規格の1000系または6000系のアルミニウム基合金であり、前記第二の合金材料は、JIS規格の2000系または7000系のアルミニウム基合金であることを特徴とする請求項2~5のいずれか一項に記載の締結部材。 The first alloy material is a JIS standard 1000 series or 6000 series aluminum base alloy, and the second alloy material is a JIS standard 2000 series or 7000 series aluminum base alloy. The fastening member according to any one of claims 2 to 5.
- ねじ山が形成された締結部材であって、
本体部と、前記本体部の径方向内側に設けられた内周部とを有し、
前記ねじ山における前記内周部は、第一の合金材料により構成されるとともに、少なくとも前記ねじ山の頂部を含む部分を形成し、
前記ねじ山における前記本体部は、前記第一の合金材料よりも高い引っ張り強さを有する第二の合金材料により構成されるとともに、前記ねじ山の根元を含む部分を形成し、
前記ねじ山における前記内周部は、周方向で肉厚が最大となる厚肉部と、周方向で肉厚が最小となる薄肉部とを有することを特徴とする締結部材。 A fastening member formed with a thread,
A main body part, and an inner peripheral part provided radially inward of the main body part,
The inner peripheral portion of the screw thread is made of a first alloy material and forms a portion including at least the top of the screw thread,
The main body portion in the screw thread is made of a second alloy material having a higher tensile strength than the first alloy material, and forms a part including the root of the screw thread,
The fastening member according to claim 1, wherein the inner peripheral portion of the screw thread has a thick portion having a maximum thickness in the circumferential direction and a thin portion having a minimum thickness in the circumferential direction.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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US16/495,466 US11286972B2 (en) | 2017-03-24 | 2018-03-02 | Fastening member |
CN201880019289.8A CN110446862B (en) | 2017-03-24 | 2018-03-02 | Fastening member |
EP18772409.1A EP3604835A4 (en) | 2017-03-24 | 2018-03-02 | Fastening member |
JP2019507498A JP6815482B2 (en) | 2017-03-24 | 2018-03-02 | Fastening member |
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JP2017058387 | 2017-03-24 | ||
JP2017-058387 | 2017-03-24 |
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PCT/JP2018/008161 WO2018173705A1 (en) | 2017-03-24 | 2018-03-02 | Fastening member |
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US (1) | US11286972B2 (en) |
EP (1) | EP3604835A4 (en) |
JP (1) | JP6815482B2 (en) |
CN (1) | CN110446862B (en) |
WO (1) | WO2018173705A1 (en) |
Cited By (2)
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JP2019215087A (en) * | 2019-09-21 | 2019-12-19 | 修吉 豆佐 | Bolt and fastening member using the same and fastening method using the same |
JP2021011926A (en) * | 2019-07-08 | 2021-02-04 | 中島特殊鋼株式会社 | Bolt and nut |
Families Citing this family (1)
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USD956544S1 (en) * | 2020-11-06 | 2022-07-05 | Wheel Pros, Llc | Bolt |
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Also Published As
Publication number | Publication date |
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EP3604835A1 (en) | 2020-02-05 |
CN110446862A (en) | 2019-11-12 |
EP3604835A4 (en) | 2020-11-25 |
CN110446862B (en) | 2022-02-01 |
JPWO2018173705A1 (en) | 2019-11-14 |
US20200072272A1 (en) | 2020-03-05 |
US11286972B2 (en) | 2022-03-29 |
JP6815482B2 (en) | 2021-01-20 |
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